Open AccessImproved setup and positioning accuracy using a three‐point customized cushion/mask/bite‐block immobilization system for stereotactic reirradiation of head and neck cancer
Author(s) -
Wang He,
Wang Congjun,
Tung Samuel,
Dimmitt Andrew Wilson,
Wong Pei Fong,
Edson Mark A.,
Garden Adam S.,
Rosenthal David I.,
Fuller Clifton D.,
Gunn Gary B.,
Takiar Vinita,
Wang Xin A.,
Luo Dershan,
Yang James N.,
Wong Jennifer,
Phan Jack
Publication year - 2016
Publication title -
journal of applied clinical medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.83
H-Index - 48
ISSN - 1526-9914
DOI - 10.1120/jacmp.v17i3.6038
Subject(s) - sabr volatility model , nuclear medicine , head and neck , computer science , medicine , mathematics , surgery , volatility (finance) , stochastic volatility , econometrics
The purpose of this study was to investigate the setup and positioning uncertainty of a custom cushion/mask/bite‐block (CMB) immobilization system and determine PTV margin for image‐guided head and neck stereotactic ablative radiotherapy (HN‐SABR). We analyzed 105 treatment sessions among 21 patients treated with HN‐SABR for recurrent head and neck cancers using a custom CMB immobilization system. Initial patient setup was performed using the ExacTrac infrared (IR) tracking system and initial setup errors were based on comparison of ExacTrac IR tracking system to corrected online ExacTrac X‐rays images registered to treatment plans. Residual setup errors were determined using repeat verification X‐ray. The online ExacTrac corrections were compared to cone‐beam CT (CBCT) before treatment to assess agreement. Intrafractional positioning errors were determined using prebeam X‐rays. The systematic and random errors were analyzed. The initial translational setup errors were − 0.8 ± 1.3 mm , − 0.8 ± 1.6 mm , and 0.3 ± 1.9 mm in AP, CC, and LR directions, respectively, with a three‐dimensional (3D) vector of 2.7 ± 1.4 mm . The initial rotational errors were up to 2.4° if 6D couch is not available. CBCT agreed with ExacTrac X‐ray images to within 2 mm and 2.5°. The intrafractional uncertainties were 0.1 ± 0.6 mm , 0.1 ± 0.6 mm , and 0.2 ± 0.5 mm in AP, CC, and LR directions, respectively, and 0.0 ∘ ± 0.5 °, 0.0 ∘ ± 0.6 °, and − 0.1 ∘ ± 0.4 ∘in yaw, roll, and pitch direction, respectively. The translational vector was 0.9 ± 0.6 mm . The calculated PTV marginsm PTV ( 90 , 95 )were within 1.6 mm when using image guidance for online setup correction. The use of image guidance for online setup correction, in combination with our customized CMB device, highly restricted target motion during treatments and provided robust immobilization to ensure minimum dose of 95% to target volume with 2.0 mm PTV margin for HN‐SABR. PACS number(s): 87.55.ne